関武夫さんという自然を愛している方が生前持っていた森を、ご遺族の方が（財）埼玉県生態系保護協会に寄付したんですね。 The sets used to determine natural quantities satisfy the Peano axioms. It follows that every theorem that could be stated and proved in Peano arithmetic will also be proved in set concept. b : becoming in accordance with or arising from character Specially as distinguish... https://www.reddit.com/user/Consistent-Load1428/